goosegos

I got an apollo spa, used, the guy had it disconnected and said it did not heat. he did say the pump worked. looks like the circuit board is burned. does anyone have an idea where to get this part and if need be what would be the equivelant(sic) p/n it is a s series gecko the p/n says sspa-1-p122-b2-02 do i need the serial number too? i do not have it hooked up but am guessing this will be the problem. thanks